So girls, why would you text a guy late at night?

I have been texting this girl for like a week. Nothing serious, we just joke around the same way we do in person. Yesterday we didn't text at all (I don't want like to be pushy) and I got her text like at one in the morning and we talked for like an hour. Why would you do this? I don't mean wanting a booty call or anything but is it because you miss him or are bored or what (no, she wanst drunk either)